US20100191431A1 - Method for operating a drivetrain - Google Patents
Method for operating a drivetrain Download PDFInfo
- Publication number
- US20100191431A1 US20100191431A1 US12/664,532 US66453208A US2010191431A1 US 20100191431 A1 US20100191431 A1 US 20100191431A1 US 66453208 A US66453208 A US 66453208A US 2010191431 A1 US2010191431 A1 US 2010191431A1
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- Prior art keywords
- clutch
- speed gradient
- rotational speed
- vehicle
- gradient
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- Abandoned
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims abstract description 37
- 238000012544 monitoring process Methods 0.000 claims 2
- 230000001133 acceleration Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D48/00—External control of clutches
- F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
- F16D48/068—Control by electric or electronic means, e.g. of fluid pressure using signals from a manually actuated gearshift linkage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
- B60W10/11—Stepped gearings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/19—Improvement of gear change, e.g. by synchronisation or smoothing gear shift
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/0437—Smoothing ratio shift by using electrical signals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/10—Change speed gearings
- B60W2510/1015—Input shaft speed, e.g. turbine speed
- B60W2510/102—Input speed change rate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/10—Change speed gearings
- B60W2510/104—Output speed
- B60W2510/1045—Output speed change rate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/30—Signal inputs
- F16D2500/308—Signal inputs from the transmission
- F16D2500/3081—Signal inputs from the transmission from the input shaft
- F16D2500/30816—Speed of the input shaft
- F16D2500/30818—Speed change rate of the input shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/30—Signal inputs
- F16D2500/308—Signal inputs from the transmission
- F16D2500/3082—Signal inputs from the transmission from the output shaft
- F16D2500/30825—Speed of the output shaft
- F16D2500/30827—Speed change rate of the output shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/30—Signal inputs
- F16D2500/31—Signal inputs from the vehicle
- F16D2500/3107—Vehicle weight
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/30—Signal inputs
- F16D2500/31—Signal inputs from the vehicle
- F16D2500/3108—Vehicle speed
- F16D2500/3109—Vehicle acceleration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/30—Signal inputs
- F16D2500/31—Signal inputs from the vehicle
- F16D2500/3114—Vehicle wheels
- F16D2500/3115—Vehicle wheel speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/50—Problem to be solved by the control system
- F16D2500/506—Relating the transmission
- F16D2500/50684—Torque resume after shifting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
- F16D2500/70422—Clutch parameters
- F16D2500/70438—From the output shaft
- F16D2500/7044—Output shaft torque
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
- F16D2500/70452—Engine parameters
- F16D2500/70458—Engine torque
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
- F16D2500/70464—Transmission parameters
- F16D2500/70466—Input shaft
- F16D2500/70472—Input shaft speed
- F16D2500/70474—Input shaft speed change rate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
- F16D2500/70464—Transmission parameters
- F16D2500/70476—Output shaft
- F16D2500/70484—Output shaft speed
- F16D2500/70486—Output shaft speed change rate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2500/00—External control of clutches by electric or electronic means
- F16D2500/70—Details about the implementation of the control system
- F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
- F16D2500/70492—Vehicle parameters
- F16D2500/70494—Vehicle speed
- F16D2500/70496—Vehicle acceleration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H2306/00—Shifting
- F16H2306/40—Shifting activities
- F16H2306/52—Applying torque to new gears
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/48—Inputs being a function of acceleration
Definitions
- the invention concerns a method for operating a drivetrain of a motor vehicle comprising an automatic transmission and a power.
- the main components of a motor vehicle's drivetrain are a power engine and a transmission.
- the transmission converts the traction force provided by the power engine.
- the present invention concerns a method for operating a drivetrain of a motor vehicle that comprises a transmission in the form of an automatic transmission, and a power engine.
- automated transmission is here intended to be understood as any transmission with automatic or automated gearshifts, and these can also be called multi-step automatic transmissions.
- a clutch of the drivetrain arranged between the power engine and the automatic transmission is first disengaged and then engaged.
- the clutch is only engaged when a rotational speed difference between a transmission input speed and a power engine speed is smaller than a defined limit value. This can sometimes have the result that after carrying out a gearshift, the clutch is only engaged after a relatively long delay and this has an adverse effect on the shifting quality and the driving behavior.
- a method in which a power engine and a clutch are controlled in co-ordination during a gearshift in such a manner that a nominal value for a clutch torque is established at a point in time as a function of a reference clutch output torque, and a nominal value for the torque of the power engine at that point in time consists of a regulation fraction and a control fraction, such that the regulation fraction is determined from a deviation of a rotational speed of the power engine from a rotational speed trajectory at the said time, and such that the control fraction is established as a function of the rotational speed trajectory at the time, a future course of the speed trajectory and a torque trajectory.
- the present invention addresses the problem of providing a new type of method for operating a drivetrain of a motor vehicle.
- a vehicle speed gradient or a transmission input rotational speed gradient or a transmission output rotational speed gradient or a wheel rotational speed gradient is monitored, and after the gearshift has been carried out the clutch is engaged in such a manner that the gradient being monitored is within a defined range of values or assumes a defined value.
- the clutch in a simple manner the clutch can be engaged immediately after carrying out a shift operation or a gearshift. Thanks to the method according to the invention a rotational speed difference between the speed of the power engine and the transmission input speed is reduced within a short time with no perceptible adverse effect on shift quality and hence on the driving comfort. By virtue of the method according to the invention, a short load interruption time can be ensured.
- a clutch torque is calculated and the clutch is actuated in such manner that on engagement, it transfers the calculated clutch torque.
- FIG. 1 Diagrammatic representation of a drivetrain
- FIG. 1 shows in very simplified form the layout of a drivetrain of a motor vehicle, the drivetrain comprising a power engine 1 , an automatic transmission 2 and driven wheels 3 of the motor vehicle.
- the automatic transmission 2 transfers a traction force produced by the power engine 1 to the wheels 3 of the motor vehicle.
- An automatically actuated clutch 4 is connected between the automatic transmission 2 and the power engine 1 .
- the present invention concerns a method for operating such a drivetrain, namely for carrying out a shift operation, in particular an upshift.
- a shift operation in particular an upshift.
- the clutch 4 is first disengaged, so when a shift operation is carried out a load interruption takes place and after the shift has been completed the clutch 4 must be engaged again.
- what is now required is to provide a method whereby the clutch 4 can be engaged immediately after a shift operation or gearshift has been carried out, so that the load interruption time is as short as possible.
- a vehicle speed gradient i.e. the vehicle's acceleration is preferably monitored, and once a shift operation has been carried out the clutch 4 is engaged in such manner that the vehicle speed gradient monitored is within a defined range of values or assumes a defined value.
- the defined value range or defined value is determined as a function of a mass of the motor vehicle and a driving situation of the motor vehicle.
- the defined value range or defined value depends on whether the motor vehicle is moving over level ground or on an uphill slope.
- the defined value range or value preferably depends on whether the motor vehicle is being driven on a road, or off-road.
- the preferred procedure is to calculate a clutch torque from the defined value or a value within the defined value range that the monitored vehicle speed gradient should assume when the clutch is engaged.
- the clutch 4 is then actuated in such manner that on engagement, it transfers the calculated clutch torque.
- a transmission input speed gradient, a transmission output speed gradient or even a wheel rotational speed gradient can also be monitored as alternatives, and when the shift operation has been carried out the clutch 4 is engaged in such manner that whichever gradient is being monitored lies within a defined range of values or assumes a defined value. Then, from the defined value the clutch torque that the clutch 4 should transmit on engagement is again calculated.
- the torque provided by the power engine 1 can be increased so as to provide the desired gradients when the clutch 4 is engaged.
- the clutch 4 When during the engagement of the clutch 4 the vehicle speed gradient or one of the rotational speed gradients should be increased, to do this the clutch 4 must be engaged farther. On the other hand, if the vehicle gradient or one of the rotational speed gradients should be made smaller, then to do this the clutch must be disengaged farther. But since a drivetrain is a system capable of fluctuation, it is entirely possible that if the vehicle gradient or one of the rotational speed gradients should be made larger, the clutch 4 of the drivetrain has to be disengaged farther for a short time. Likewise, when the vehicle gradient or one of the rotational speed gradients should be made smaller, the clutch 4 may have to be engaged farther for a short time.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Automation & Control Theory (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Transmission Device (AREA)
Abstract
A method for operating a drivetrain comprising an automatic transmission (2) and a power engine (1) such that, in order to carry out a shift operation, in particular an upshift, a clutch (4) connected between the automatic transmission (2) and the power engine is first disengaged and, after carrying out the shift operation, engaged again. A vehicle speed gradient, a transmission input rotational speed gradient, a transmission output rotational speed gradient or a wheel rotational speed gradient is monitored, and after the shift operation has been carried out, the clutch (4) is engaged in such a manner that the gradient being monitored lies within a defined range of values or assumes a defined value.
Description
- This application is a National Stage completion of PCT/EP2008/056447 filed May 27, 2008, which claims priority from German patent application serial no. 10 2007 030 493.7 filed Jun. 30, 2007.
- The invention concerns a method for operating a drivetrain of a motor vehicle comprising an automatic transmission and a power.
- The main components of a motor vehicle's drivetrain are a power engine and a transmission. The transmission converts the traction force provided by the power engine. The present invention concerns a method for operating a drivetrain of a motor vehicle that comprises a transmission in the form of an automatic transmission, and a power engine. The term ‘automatic transmission’ is here intended to be understood as any transmission with automatic or automated gearshifts, and these can also be called multi-step automatic transmissions.
- When a gearshift or shift operation is carried out, a clutch of the drivetrain arranged between the power engine and the automatic transmission is first disengaged and then engaged. With automatic transmissions known from practice, when a gearshift or shift operation has been carried out, the clutch is only engaged when a rotational speed difference between a transmission input speed and a power engine speed is smaller than a defined limit value. This can sometimes have the result that after carrying out a gearshift, the clutch is only engaged after a relatively long delay and this has an adverse effect on the shifting quality and the driving behavior. To counteract that, it is also already known from the prior art to brake the power engine so that the speed of the power engine approaches the transmission input speed more quickly, thereby reducing the time before the clutch is engaged. However, this wastes energy.
- From DE 100 26 332 A1 a method is known, in which a power engine and a clutch are controlled in co-ordination during a gearshift in such a manner that a nominal value for a clutch torque is established at a point in time as a function of a reference clutch output torque, and a nominal value for the torque of the power engine at that point in time consists of a regulation fraction and a control fraction, such that the regulation fraction is determined from a deviation of a rotational speed of the power engine from a rotational speed trajectory at the said time, and such that the control fraction is established as a function of the rotational speed trajectory at the time, a future course of the speed trajectory and a torque trajectory.
- Starting from here, the present invention addresses the problem of providing a new type of method for operating a drivetrain of a motor vehicle.
- According to the invention, a vehicle speed gradient or a transmission input rotational speed gradient or a transmission output rotational speed gradient or a wheel rotational speed gradient is monitored, and after the gearshift has been carried out the clutch is engaged in such a manner that the gradient being monitored is within a defined range of values or assumes a defined value.
- With the method according to the invention, in a simple manner the clutch can be engaged immediately after carrying out a shift operation or a gearshift. Thanks to the method according to the invention a rotational speed difference between the speed of the power engine and the transmission input speed is reduced within a short time with no perceptible adverse effect on shift quality and hence on the driving comfort. By virtue of the method according to the invention, a short load interruption time can be ensured.
- Preferably, from a defined value which the monitored gradient should assume when the clutch is engaged, a clutch torque is calculated and the clutch is actuated in such manner that on engagement, it transfers the calculated clutch torque.
- Example embodiments of the invention, to which it is not limited, are described in more detail with reference to the drawing, which shows:
-
FIG. 1 : Diagrammatic representation of a drivetrain -
FIG. 1 shows in very simplified form the layout of a drivetrain of a motor vehicle, the drivetrain comprising apower engine 1, an automatic transmission 2 and drivenwheels 3 of the motor vehicle. The automatic transmission 2 transfers a traction force produced by thepower engine 1 to thewheels 3 of the motor vehicle. An automatically actuated clutch 4 is connected between the automatic transmission 2 and thepower engine 1. - The present invention concerns a method for operating such a drivetrain, namely for carrying out a shift operation, in particular an upshift. To carry out a shift operation the clutch 4 is first disengaged, so when a shift operation is carried out a load interruption takes place and after the shift has been completed the clutch 4 must be engaged again. In the sense of the present invention what is now required is to provide a method whereby the clutch 4 can be engaged immediately after a shift operation or gearshift has been carried out, so that the load interruption time is as short as possible.
- In the sense of the present invention, for this purpose a vehicle speed gradient, i.e. the vehicle's acceleration is preferably monitored, and once a shift operation has been carried out the clutch 4 is engaged in such manner that the vehicle speed gradient monitored is within a defined range of values or assumes a defined value.
- Preferably, the defined value range or defined value is determined as a function of a mass of the motor vehicle and a driving situation of the motor vehicle. In particular, the defined value range or defined value depends on whether the motor vehicle is moving over level ground or on an uphill slope. Furthermore, the defined value range or value preferably depends on whether the motor vehicle is being driven on a road, or off-road.
- to control the clutch 4, the preferred procedure is to calculate a clutch torque from the defined value or a value within the defined value range that the monitored vehicle speed gradient should assume when the clutch is engaged. The clutch 4 is then actuated in such manner that on engagement, it transfers the calculated clutch torque.
- Instead of the vehicle's speed gradient, a transmission input speed gradient, a transmission output speed gradient or even a wheel rotational speed gradient can also be monitored as alternatives, and when the shift operation has been carried out the clutch 4 is engaged in such manner that whichever gradient is being monitored lies within a defined range of values or assumes a defined value. Then, from the defined value the clutch torque that the clutch 4 should transmit on engagement is again calculated.
- In addition, during the engagement of the clutch 4 the torque provided by the
power engine 1 can be increased so as to provide the desired gradients when the clutch 4 is engaged. - When during the engagement of the clutch 4 the vehicle speed gradient or one of the rotational speed gradients should be increased, to do this the clutch 4 must be engaged farther. On the other hand, if the vehicle gradient or one of the rotational speed gradients should be made smaller, then to do this the clutch must be disengaged farther. But since a drivetrain is a system capable of fluctuation, it is entirely possible that if the vehicle gradient or one of the rotational speed gradients should be made larger, the clutch 4 of the drivetrain has to be disengaged farther for a short time. Likewise, when the vehicle gradient or one of the rotational speed gradients should be made smaller, the clutch 4 may have to be engaged farther for a short time.
- With the method according to the invention, relatively short load interruption times can be achieved when carrying out a shift operation, in particular an upshift. Especially on uphill slopes the fuel consumption can be reduced. Moreover, with the method according to the invention a better acceleration ability of the motor vehicle can be ensured.
- Indexes
- 1 Power engine
- 2 Automatic transmission
- 3 Wheels
- 4 Clutch
Claims (7)
1-5. (canceled)
6. A method for operating a drivetrain comprising an automatic transmission and a power engine (1) such that, in order to carry out a shift operation, in particular an upshift, a clutch (4) connected between the automatic transmission (2) and the power engine (1) is first disengaged and, after carrying out the shift operation, engaged again, the method comprising the steps of:
monitoring one of a vehicle speed gradient, a transmission input rotational speed gradient, a transmission output rotational speed gradient and a wheel rotational speed gradient and, after the shift operation has been carried out,
engaging the clutch (4) in such manner that the gradient being monitored at least one of lies within a defined range of values and assumes a defined value.
7. The method according to claim 6 , the method comprising the step of determining one of the defined value range and the defined value as a function of a mass of the motor vehicle.
8. The method according to claim 6 , further comprising the step of determining one of the defined value range or the defined value as a function of a driving situation of the motor vehicle.
9. The method according to claim 6 , further comprising the step of calculating a clutch torque from a defined value which the gradient being monitored should assume when the clutch (4) is engaged and the clutch (4) is actuated in such a manner that, upon engagement, the clutch transmits a calculated clutch torque.
10. The method according to claim 6 , further comprising the step of increasing a torque of the power engine during the engagement of the clutch (4).
11. A method of up-shifting a drivetrain of a vehicle comprising an automatic transmission and a power engine, the method comprising the steps of:
disengaging a clutch (4) connected between the automatic transmission (2) and the power engine (1);
monitoring one of a speed gradient of the vehicle, a rotational speed gradient of a transmission input, a rotational speed gradient of a transmission output and a rotational speed gradient of a wheel of the vehicle;
executing a gearshift;
determining, as a function of one of a mass of the vehicle and a driving situation of the vehicle, at least one of a defined value and a defined value range of the one of the speed gradient of the vehicle, the rotational speed gradient of the transmission input, the rotational speed gradient of the transmission output and the rotational speed gradient of the wheel of the vehicle;
adjusting a clutch torque from the power engine (1) to a torque which results in a desired value of one of the speed gradient of the vehicle, the rotational speed gradient of the transmission input, the rotational speed gradient of the transmission output and the rotational speed gradient of the wheel of the vehicle such that the desired value is at least one of equal to the defined value and within the defined range of values upon engagement of the clutch (4); and
engaging the clutch (4).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007030493A DE102007030493A1 (en) | 2007-06-30 | 2007-06-30 | Method for operating a drive train |
DE102007030493.7 | 2007-06-30 | ||
PCT/EP2008/056447 WO2009003766A1 (en) | 2007-06-30 | 2008-05-27 | Method for operating a drivetrain |
Publications (1)
Publication Number | Publication Date |
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US20100191431A1 true US20100191431A1 (en) | 2010-07-29 |
Family
ID=39689202
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/664,532 Abandoned US20100191431A1 (en) | 2007-06-30 | 2008-05-27 | Method for operating a drivetrain |
Country Status (4)
Country | Link |
---|---|
US (1) | US20100191431A1 (en) |
EP (1) | EP2160522A1 (en) |
DE (1) | DE102007030493A1 (en) |
WO (1) | WO2009003766A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120265409A1 (en) * | 2011-04-14 | 2012-10-18 | Denso Corporation | Vehicle control apparatus |
CN104265877A (en) * | 2014-08-12 | 2015-01-07 | 潍柴动力股份有限公司 | Control method and device of automatic gearbox |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7985163B2 (en) * | 2007-12-13 | 2011-07-26 | Ford Global Technologies, Llc | Adaptive clutch torque control for a powershift transmission |
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US4677880A (en) * | 1984-12-28 | 1987-07-07 | Isuzu Motors Limited | Method of controlling automatic transmission in accordance with engine operation |
US4799160A (en) * | 1984-11-07 | 1989-01-17 | Renault Agriculture | Clutch automation device |
US5109967A (en) * | 1989-03-28 | 1992-05-05 | Aisin Seiki K.K. | Electronically controlled clutch engagement speed correcting for an automatic transmission system |
US6332860B1 (en) * | 2000-03-20 | 2001-12-25 | General Motors Corporation | Model-based on-coming clutch pressure control for an automatic transmission upshift |
US6364811B1 (en) * | 2000-03-20 | 2002-04-02 | General Motors Corporation | Model-based transmission upshift control with engine torque management |
US6564136B2 (en) * | 2001-03-28 | 2003-05-13 | Honda Giken Kogyo Kabushiki Kaisha | Acceleration control apparatus for vehicle |
US6656085B2 (en) * | 2000-02-19 | 2003-12-02 | Robert Bosch Gmbh | Method for controlling an automatic transmission |
US20060211536A1 (en) * | 2002-10-26 | 2006-09-21 | Daimlerchrysler Ag | Method for controlling a drive train comprising an automatic clutch |
US7556589B1 (en) * | 2000-10-06 | 2009-07-07 | Stearns Kenneth W | Total body exercise methods and apparatus |
US7556586B2 (en) * | 2004-07-28 | 2009-07-07 | Komatsu Ltd. | Shift control device and shift control method for vehicle |
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FR2715896B1 (en) * | 1994-02-08 | 1996-05-10 | Renault Agriculture | A clutch control method for regulating the longitudinal acceleration of a utility vehicle. |
DE19815666B4 (en) * | 1997-05-15 | 2011-03-17 | Zf Sachs Ag | Method for operating an actuator for the automated actuation of a friction clutch and an automated manual transmission |
DE10026332A1 (en) | 1999-12-28 | 2001-07-12 | Bosch Gmbh Robert | Motor vehicle engine to clutch linkage method for gear changes involves fixing value of clutch torque and engine output to provide a control signal with respect to pre-set values |
FR2837432B1 (en) * | 2002-03-19 | 2005-04-29 | Valeo | METHOD AND CONTROL DEVICE FOR A CHANGE OF TRANSMISSION RATIO IN A ROBOTIZED GEARBOX FOR MOTOR VEHICLES |
JP2004116748A (en) * | 2002-09-30 | 2004-04-15 | Aisin Seiki Co Ltd | Creep torque control device |
DE102005029587B4 (en) * | 2004-07-22 | 2020-08-06 | Schaeffler Technologies AG & Co. KG | Method and device for controlling a drive train of a vehicle |
-
2007
- 2007-06-30 DE DE102007030493A patent/DE102007030493A1/en not_active Withdrawn
-
2008
- 2008-05-27 EP EP08760045A patent/EP2160522A1/en not_active Withdrawn
- 2008-05-27 WO PCT/EP2008/056447 patent/WO2009003766A1/en active Application Filing
- 2008-05-27 US US12/664,532 patent/US20100191431A1/en not_active Abandoned
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4799160A (en) * | 1984-11-07 | 1989-01-17 | Renault Agriculture | Clutch automation device |
US4677880A (en) * | 1984-12-28 | 1987-07-07 | Isuzu Motors Limited | Method of controlling automatic transmission in accordance with engine operation |
US5109967A (en) * | 1989-03-28 | 1992-05-05 | Aisin Seiki K.K. | Electronically controlled clutch engagement speed correcting for an automatic transmission system |
US6656085B2 (en) * | 2000-02-19 | 2003-12-02 | Robert Bosch Gmbh | Method for controlling an automatic transmission |
US6332860B1 (en) * | 2000-03-20 | 2001-12-25 | General Motors Corporation | Model-based on-coming clutch pressure control for an automatic transmission upshift |
US6364811B1 (en) * | 2000-03-20 | 2002-04-02 | General Motors Corporation | Model-based transmission upshift control with engine torque management |
US7556589B1 (en) * | 2000-10-06 | 2009-07-07 | Stearns Kenneth W | Total body exercise methods and apparatus |
US6564136B2 (en) * | 2001-03-28 | 2003-05-13 | Honda Giken Kogyo Kabushiki Kaisha | Acceleration control apparatus for vehicle |
US20060211536A1 (en) * | 2002-10-26 | 2006-09-21 | Daimlerchrysler Ag | Method for controlling a drive train comprising an automatic clutch |
US7556586B2 (en) * | 2004-07-28 | 2009-07-07 | Komatsu Ltd. | Shift control device and shift control method for vehicle |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120265409A1 (en) * | 2011-04-14 | 2012-10-18 | Denso Corporation | Vehicle control apparatus |
US8818645B2 (en) * | 2011-04-14 | 2014-08-26 | Denso Corporation | Vehicle control apparatus |
CN104265877A (en) * | 2014-08-12 | 2015-01-07 | 潍柴动力股份有限公司 | Control method and device of automatic gearbox |
Also Published As
Publication number | Publication date |
---|---|
WO2009003766A1 (en) | 2009-01-08 |
DE102007030493A1 (en) | 2009-01-08 |
EP2160522A1 (en) | 2010-03-10 |
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AS | Assignment |
Owner name: ZF FRIEDRICHSHAFEN AG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HERTER, PETER;BITZER, FRANZ;PETZOLD, RAINER;AND OTHERS;REEL/FRAME:023663/0989 Effective date: 20091109 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |